SOLUTION: I'm not sure if I am putting this problem in the right spot. But could I get some help on it. It is from a homework sheet. Find the minor for the element in the first row and seco

Algebra ->  Matrices-and-determiminant -> SOLUTION: I'm not sure if I am putting this problem in the right spot. But could I get some help on it. It is from a homework sheet. Find the minor for the element in the first row and seco      Log On


   

Question 138808: I'm not sure if I am putting this problem in the right spot. But could I get some help on it. It is from a homework sheet.
Find the minor for the element in the first row and second column of the given matrix.
%28matrix%283%2C3%2C11%2C-11%2C20%2C-3%2C19%2C16%2C4%2C6%2C-8%29%29
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
I'm not sure if I am putting this problem in the right spot. But could I get some help on it. It is from a homework sheet.
Find the minor for the element in the first row and second column of the given matrix. 


%28matrix%283%2C3%2C11%2C-11%2C20%2C-3%2C19%2C16%2C4%2C6%2C-8%29%29

The first row are the numbers across the top: matrix%281%2C3%2C11%2C-11%2C20%29

The second column are the numbers down the middle: matrix%283%2C1%2C-11%2C19%2C6%29

So the element in the first row and second column is the number -11

Let's cross out all the elements in the first row and the second column:



Now copy those numbers not crossed out into a 2x2 matrix:

%28matrix%282%2C2%2C-3%2C16%2C4%2C-8%29%29 

That 2x2 matrix is the minor matrix of -11.

Edwin